docs: def add_mongo_config_simple(app, connection_string, collection_name):
      """
      Configure the app to use MongoDB.
  
      :param app: Flask Application
      :type app: Flask
      :param connection_string: in format host:port:database or database
              (default: sacred)
      :type connection_string: str
  
      :param collection_name: Name of the collection
      :type collection_name: str
      """
      split_string = connection_string.split(":")
      config = {"host": "localhost", "port": 27017, "db": "sacred"}
      if len(split_string) > 0 and len(split_string[-1]) > 0:
          config["db"] = split_string[-1]
      if len(split_string) > 1:
          config["port"] = int(split_string[-2])
      if len(split_string) > 2:
          config["host"] = split_string[-3]
      app.config["data"] = PyMongoDataAccess.build_data_access(
          config["host"], config["port"], config["db"], collection_name)